I can't speak to thinkpads, but I've had two silvery mac laptops: first a 12" powerbook and now a 15" MBP. Both have treated me exceedingly well. The one problem I've had was that I managed to knock the shift key off of the powerbook keyboard one time. It was a bitch to get back on properly, but once I did, it was good as new and stayed put. The 12" is still going strong—I passed it off to my sister after upgrading. The 15er is a bit big and a bit heavy for my tastes, but the extra screen space is worth it.

My only testimony towards the durability of my macbook pro is this. I bike everywhere, and two times now I've fallen with the MBP in my backpack and knocked it with some force against the ground. The remainder of those rides I'm always sure that the $2000+ hunk of aluminum in my bag will be ruined, but when I get where I'm going and pull it out, it works like a champ.